When you do know about me I am something

When you do know about me I am something

When you do know about me I am something

Solve me this:

When you do know about me I am something riddle

When you do know about me, I am something. But when you know me, I am nothing. What am I?

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ANSWER

A riddle.

 

Now try to solve this:

clever riddle me this

What is always on its way but never arrives?

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ANSWER

Tomorrow.